Glass-press



( ModeL) 2 Sheets-Sheet l.

G. KUHLEWIND.

GLASS PRESS.

No. 543,154. Patented July 23; 1895.

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No. 543,154. Patented July 23', 1895.

UNITED STATES PATENT QFFICEXN CORNELIUS KUHLEWIND, OF ROCHESTER, PENNSYLVANIA.

GLASS- PRESS.

SPEGIFIGATION forming part of Letters Patent No. 543,] 54, dated July 23, 1895. 7 Application filed August 15, 1894- Serial No. 520,363. (No model.)

To all whom it may concern:

Be it known that I, CORNELIUS KUHLEWIND, of Rochester, in the county'of Beaver and State of Pennsylvania, have invented a new and useful Improvement in Glass-Presses, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a front'elevation, partly in section, of my improved glass-press. Fig. 2 is a vertical section on the line II II of Fig. 1. Fig. 3 is an enlarged cross-section on the line III III of'Fig 1. Fig. 4 is an enlarged detail view of the valve mechanism in the hydraulic cylinder, and Fig. 5 is a detail view of another valve employed in the cylinder.

'Like symbols of reference indicate like parts in each figure.

presses and is designed to provide a press which may be operated by mechanical power rather than by hand, as has been formerly necessary. Heretofore, when power was employed, as the plunger must descend to exactly the same point at each stroke, it the operator inserted too much glass in the mold the plunger descending would break the mold, asno means was provided for graduating the stroke, as in hand-power. My inventionovercomes these difficulties; and it consists, broadly, in a glass-press provided with means whereby, when the amount of resistance rises above a certain point, the plunger will stop and thereafter a positive pressure, the full pressure being exerted only after the glass has begun to flow, as a too-sudden application of the full pressure acts in the nature of a blow and would tend to break the mold before the viscous glass could begin to flow; and itconsists, thirdly, in the construction andarrangement of parts, as hereinafter more fully described, and set forth in the claims.

My invention relates to the class of glass and having centrally secured therein the vertical screw-threaded rod 7, adj ustably fastened at its upper end to the plate 8 by nuts 9 and 10. To the plate 8 are secured the depending rods 11, which are four in number, and at their lower ends carry a plate 12, from which the presser-plate 13 is hung by rods 14 pass- 20, which pass through the cross-head 5 and the'head of a hydraulic cylinder 21, and are secured in a piston-head 22 therein. Spiral springs 23 encircle the rods 20 and bear against the lower face of the cross-head 5 and the upper cylinder-head, respectively, and from the lower face of the cross-head depend two frames or braces 24, carrying adjustable screw-threaded tappets 25 and 26, respectively.

The piston-head 22 of the hydraulic cylinder is provided with a central aperture closed by an upwardly-opening valve 27, having side ports 28 and a stein 29, which extends up through the piston-head and is pivotally connected with alever 30, pivoted to a standard 31, also secured in the piston-head. The lever 30 is provided with a series of notches, and a weight 31 is hung thereon,this weight being adjusted to bring any desired pressure upon the valve. A spring may be used in place of the weight. Pivoted to the upper end of the stem 29 is a second lever 32, fulcrumed in the standard 31, and pivotally connected with the stem 33 of a downwardly-opening valve 34. The valve 34 is given the longer the valve 34:; but when the pressure *rises above a certain amount the valves 27 and 34 leverage,;and the valves are so proportioned that the upward pressure upon the central valvetisordinarily insufficient to force down IOO are unseated and the piston-head moves down in the cylinder. Either lever maybe used without the other, each operating automatically whenever too much glass is cut off in the mold. The lever 32 is positively operated by the tappet 25 when the cross-head 5 reaches a certain point.

The lever 30 is provided with a vertical hole, through which passes the stem 35 of a downwardly'opening valve 36, which is operated by the tappet 26 after the cross-head 5 has moved down a determined distance. The piston-head is also provided with four downwardly-opening valves 37, one of which is shown in Fig. 5, these valves having short stems 38, provided with collars 39, against which press spiral springs 40, surrounding the stem and holding the valves to their seats. When an upward pressure is applied to the piston in the cylinder, these valves open and allow the fluid above the piston to flow through it as the piston rises. To stop the upward movement of the piston-head beyond a certain point I provide collars 41, surrounding the rods 20, and butting against the upper cylinder-head. The lower cylinder-head is extended to-form collars 42, surrounding the standards 2 and guiding the cylinder in its movements, and centrally secured to this head is the screw-spindle 4:3, to which is adjustably' fastened a cross-bar H by means of the adjustable nuts 45. Secured in the cross-bar 44 are rods 46, which at their lower ends are fastened in the bar 17, within which are pivoted the usual clamp-levers 47, which take under a collar upon the upper end of the plunger and support the same, and are secured by the conical nut 48 working upon the screw spindle 43.

49am the depending links, pivoted to the cross-head 5, and connected at their lower ends to a crank, eccentric, or other actuating element.

In operation the cylinder 21 is filled with oil or other suitable liquid, so that pressure exerted upon the piston-head will move down the plunger unless the valves in the pistonhead are opened to allow it to move downwardly in the cylinder.

The operation is as follows: A suitable amount of glass being out off in the mold located on the base 3 beneath the plunger, the links 49 move down the cross-head 5, and this pressing upon the springs 23 forces down the plunger with an easy yielding pressure in starting the flow of glass within the mold. As soon, however, as the nut 18 strikes the bar 19 the-rods 20 are moved down positively and through the cylinder, which acts as a solid piece, forces the plunger downwardly, and

downwardly in the cylinder through the remainder of the stroke, the cylinder and plunger remaining stationary. Breakage of the parts is thus avoided, as would inevitably occur it the plunger moved downwardly through the whole stroke when too much glass is contained within the mold. If desired, instead of using the weighted lever 30 the lever 32 may be used, this being operated to prevent downward movement of the plunger if too much glass is cut off. At a certain point in the downward movement the tappets 25 and 26 positively open the valves 34 and 36 and allow the oil to flow upwardly in the cylinder. On the return movement of the cross-head the oil flows downwardly through the valves 34, 36, and 37, the piston-head resuming its normal position in the cylinder.

It is evident that the device for stopping downward movement of the plunger, when a certain resistance is met, may be used to ad vantage in many other connectionssucl1 as in hammers, die-presses, &c.and I do not therefore wish to restrict myself to its use in glass-presses alone, the word former being used broadly to designate a moving forming element.

The advantages of my inventionwill be apparent to those skilled in the art, since the difficulty of using power-glass presses is entirely removed, while the initial pressure is of a light yielding character similar to handpresses, the full power being exerted only after the glass has begun to flow.

Many variations in the form, construction, and relative arrangement of the parts of my invention may be made by the skilled mechanic without departure therefrom; since,

What I claim is- 1. In a 'press, a reciprocating two-part former, one part being secured to a cylinder having closed ends, and the other to a valved piston within the cylinder; the positively actuated part being arranged to move the other part in both directions, substantially as described.

2. In a press, a reciprocating twopart former, one part being secured to a cylinder having closed ends, and the other to a piston therein, and a valve in said piston having a weighted stem; the positively actuated part being arranged to move the other part in both directions, substantially as described.

3. In a press, a two-part former, one part being secured to a cylinder, and the other to a piston within the cylinder, and a valve in the piston having a weighted stem and independent of the former; substantially as described.

4. A power press having a yielding connec tion with the plunger, and a separate positive connection which actuates the plunger after it has moved a certain distance; substantially as described.

5. A press having a moving cross-head, springs between the cross-head and the plun IIO , gel, and a projection upon the cross head arupwardly opening valve also connected to the 10 ranged to engage the plunger and move it lever; substantially as described. positively after the cross-head has moved a In testimony whereof I have hereunto set certain distance; substantially as described. my hand.

5 6. A press having a two-part former, one

part being secured to a cylinder and the other CORNELIUS KUHLEWIND' to a piston or plunger within the cylinder, a Witnesses: downwardly opening valve in the piston-head H. M. CORWIN, having a stem provided with a lever, and an F. E. GAITHER. 

